Systems and methods for optimizing the application of pulse width modulation (PWM) in a voltage signal for delivering a current in a valve used to alternatively deliver pressurized gas to and vent from chambers in a vitrectomy probe used to drive a cutter.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The system of claim 1, wherein the predetermined total current drop is 10 milliamps.
3. The system of claim 1, wherein the PWM mode comprises a constant PWM with a fixed duty cycle and a fixed frequency.
4. The system of claim 1, wherein the PWM mode comprises a variable PWM with a variable duty cycle and a variable frequency.
5. The system of claim 1, wherein the valve, the power supply, the current sensor, and the system controller are integrated in an ophthalmic surgical console.
7. The method of claim 6, wherein the predetermined total current drop is 10 milliamps.
8. The method of claim 6, wherein the PWM mode comprises a constant PWM with a fixed duty cycle and a fixed frequency.
9. The method of claim 6, wherein the PWM mode comprises a variable PWM with a variable duty cycle and a variable frequency.
10. The system of claim 1, wherein the system controller being configured to observe that a subsequent series of subsequent samples in a sampling band are successively lower includes the system controller being configured to observe that at least ten successive samples are successively lower.
11. The system of claim 1, wherein the system controller being configured to observe that another series of subsequent samples are successively higher includes the system controller being configured to observe that at least ten successive samples are successively higher.
12. The method of claim 6, wherein the system controller being configured to observe that the subsequent series of subsequent samples in a sampling band are successively lower includes the system controller being configured to observe that at least ten successive samples are successively lower.
13. The method of claim 6, wherein the system controller being configured to observe that another series of subsequent samples are successively higher includes the system controller being configured to observe that at least ten successive samples are successively higher.
15. The system of claim 14, wherein the predetermined total current drop is 10 milliamps.
16. The system of claim 14, wherein the PWM mode comprises a constant PWM with a fixed duty cycle and a fixed frequency.
17. The system of claim 14, wherein the PWM mode comprises a variable PWM with a variable duty cycle and a variable frequency.
18. The system of claim 14, wherein the valve, the power supply, the current sensor, and the system controller are integrated in an ophthalmic surgical console.
19. The system of claim 14, wherein the system controller being configured to observe that a subsequent series of subsequent samples in a sampling band are successively lower includes observing that at least ten successive samples are successively lower.
21. The method of claim 20, wherein the predetermined total current drop is 10 milliamps.
22. The method of claim 20, wherein the PWM mode comprises a constant PWM with a fixed duty cycle and a fixed frequency.
23. The method of claim 20, wherein the PWM mode comprises a variable PWM with a variable duty cycle and a variable frequency.
24. The method of claim 20, wherein observing that a subsequent series of subsequent samples in a sampling band are successively lower includes observing that at least ten successive samples are successively lower.
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October 23, 2019
May 9, 2023
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